[android-developers] Getting "Unable to Instantiate activity; Component ClassNotFound exception"

I'm suddenly unable to run my app due to this error, where the
ClassNotFound refers to my main activity class. It happens on my phone
as well as in the emulators in various versions. This is an existing
stable app that's been around for quite a while, and I haven't made any
code changes since the last time it was working a few weeks ago.

The only recent changes I've made is that I started a new project in the
same workspace and updated the Eclipse components to SDK Tools V19 and
SDK Platform Tools V11, plus updating the Eclipse plug-in as indicated.
I checked and nothing has changed in my project source directories.

Any ideas at all of what suddenly broke here?

--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en